Properties of the Number 18728

Eighteen Thousand Seven Hundred Twenty-Eight

Basics

Value: 18727 → 18728 → 18729

Parity: even

Prime: No

Previous Prime: 18719

Next Prime: 18731

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 2341

Divisors: 1, 2, 4, 8, 2341, 4682, 9364, 18728

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100100101000

Octal: 44450

Duodecimal: AA08

Hexadecimal: 4928

Square: 350737984

Square Root: 136.85028315644803

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

T(n,k)=Number of nXk 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it, modulo 4. A239819

Number of 1-sided triangular strip polyedges with n cells. A151540

Fermionic string states. A5309

Number of ways to place 3 nonattacking nightriders on a 3 X n board. A172218

Expansion of e.g.f. ∏_k>=1 1/(1 - H(k)*x^k), where H(k) is the k-th harmonic number. A305201

Number of nX4 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it, modulo 4. A239815

Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it, modulo 4. A239821

Decimal representation of the n-th iteration of the "Rule 131" elementary cellular automaton starting with a single ON (black) cell. A267450

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 57", based on the 5-celled von Neumann neighborhood. A270077

Primes less than 1000000 sorted lexicographically in decimal representation. A210761